Hi , this is a copy of what I put in Notepad to remind myself how to do this at a later date. Hope it works for you..
If you decide to use these instructions , let me know how it worked. This is first time I've been asked to give information re: changing programs
and I'd like to know if my instructions worked.
If they didn't , please don't shoot the messenger 
Good Luck,
Clay
Note:: when installing this file [Window09] into aircraft use the following procedure:
01> open Windows Explorer folder on desktop
02> open My Computer
03> open Local Disk (C:)
04> open Program Folder
05> open Microsoft Games
06> open Flight Simulator 9
07> open Aircraft Folder
08> select aircraft and open folder { ie. beech_bar0n_58 }
09> open panel folder
10> open Notepad PANEL file
11> Important to identify the Groundhandling file correctly. ie >>If Aircraft panel has FIVE [5] Window Titles ;
create another one and name it Window06=Groundhandling
12> Note the number of Window Titles within this file. Copy and Paste the Groundhandling file you have selected below the last Window title in folder
ie >> If Window06 is groundhandling file insert (paste) it below information contained in the Window=5 file information
THIS IS IMPORTANT !! Also don't forget to change to [Window06]
13> The Groundhandling file from the B1900D << [Window09] >> below is a good one to use.
14> Save any changes made to aircraft panel folder
15> Exit Notepad and Windows Explorer folder from Desktop.
16> Start up FS2004 , select aircraft the Groundhandling file was inserted into and check operation of same.
===============================================================================================================
[Window09]
Background_color=16,16,16
size_mm=240,65
window_size_ratio=1.000
position=7
visible=0
ident=10005
window_size= 0.240, 0.100
window_pos= 0.400, 0.000
gauge00=rcb_Groundhandling4!PushbackDisplay, 2,2,74,61
gauge01=rcb_Groundhandling4!TaxispeedNoToeBrakes, 79,2,64,61
gauge02=rcb_Groundhandling4!BrakePressure, 146,2,44,61
gauge03=rcb_Groundhandling4!ParkingBrakeSwitch, 193,2,44,30
gauge04=rcb_Groundhandling4!AutoTaxiAfterLanding, 193,33,44,30
gauge05=rcb_Groundhandling4!PushbackStates, 0,0
gauge06=rcb_Groundhandling4!BrakeSound, 0,0
gauge07=GH_Sound!dsd_xml_sound3, 0,0,,,./sound/Groundhandling/Sound.ini
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) There is a feature in the B1900D that is called"Groundhandling". I like it and use it on all my flights.